Update configuration.rst

Co-authored-by: Antoine Lamirault <[email protected]>

Author: ThomasLandauer

configuration.rst

@@ -417,10 +417,10 @@ When running the application, Symfony loads
 the configuration files in this order (the last files can override the values
 set in the previous ones):
 
-#. The files in ``config/packages/``;
-#. the files in ``config/packages/<environment-name>/``;
-#. ``config/services.yaml`` (and ``services.xml`` and ``services.php``);
-#. ``config/services_<environment-name>.yaml`` (and its XML and PHP version).
+#. The files in ``config/packages/*.<extension>``;
+#. the files in ``config/packages/<environment-name>/*.<extension>``;
+#. ``config/services.<extension>``;
+#. ``config/services_<environment-name>.<extension>``.
 
 Take the ``framework`` package, installed by default, as an example: